CVS log for src/usr.bin/make/unit-tests/dep-var.mk

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make: sync VarEvalMode constant names with their debug log names

make: clean up comments

No binary change, except for line numbers in assertions.

tests/make: replace 'variable expressions' with 'expressions'

tests/make: replace 'variable expression' with 'expression'

Each expression is based on a variable, there's no need for the
verbosity.  The wording in make's diagnostics will be changed in a
follow-up commit.

tests/make: clean up comments in tests

tests/make: update test for evaluating undefined variables

make: remove filler word 'Do' from function names for parsing

No functional change, except for debug logging.

make(1): explain why the dep-var test behaves differently in lint mode

make(1): fix off-by-one error in SuffExpandChildren

In suff.c r1.144 from yesterday, in the line "cp += nested_p - cp", I
accidentally removed the "- 1".  Since these "- 1" lines lead to slow
execution, each branch now increments the pointer separately by the
actually needed amount.

Fixing this bug posed way more new questions than it answered, and it
revealed an inconsistency in the parser about how characters are to be
escaped, and missing details in the documentation of Var_Parse, as well
as a parse error that unexpectedly doesn't stop make from continuing.

make(1): add test for expansion of indirect variables in dependencies

make: extend test for unresolved variables in dependencies

This is to ensure that the upcoming refactoring of Var_Parse in
SuffExpandChildren does not break anything.

make(1): add test for deferred variable expansion in dependencies